| Adsorption process | Thermodynamic charactrisitss |
| spontaneous | ΔG0 (−) |
| non spontaneous | ΔG0 (+) |
| exothermic | ΔH0 (−) |
| endothermic | ΔH0 (+) |
| affinity between adsorbent and adsorbate | ΔS0 (+) and ΔG0 (−) |
| no affinity between adsorbent and adsorbate | ΔS0 (+) and ΔG0 (+) |